File: slice-position-bounds-check.rs

package info (click to toggle)
rustc-web 1.78.0%2Bdfsg1-2~deb11u3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,245,360 kB
  • sloc: xml: 147,985; javascript: 18,022; sh: 11,083; python: 10,265; ansic: 6,172; cpp: 5,023; asm: 4,390; makefile: 4,269
file content (31 lines) | stat: -rw-r--r-- 795 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
//@ compile-flags: -O -C panic=abort
#![crate_type = "lib"]

fn search<T: Ord + Eq>(arr: &mut [T], a: &T) -> Result<usize, ()> {
    match arr.iter().position(|x| x == a) {
        Some(p) => {
            Ok(p)
        },
        None => Err(()),
    }
}

// CHECK-LABEL: @position_no_bounds_check
#[no_mangle]
pub fn position_no_bounds_check(y: &mut [u32], x: &u32, z: &u32) -> bool {
    // This contains "call assume" so we cannot just rule out all calls
    // CHECK-NOT: panic_bounds_check
    if let Ok(p) = search(y, x) {
      y[p] == *z
    } else {
      false
    }
}

// just to make sure that panicking really emits "panic_bounds_check" somewhere in the IR
// CHECK-LABEL: @test_check
#[no_mangle]
pub fn test_check(y: &[i32]) -> i32 {
    // CHECK: panic_bounds_check
    y[12]
}